单项选择题
A.for
B.as
C.with
D.by
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单项选择题
A.DiscoveredB.actedC.inventedD.designed
A.Discovered
B.acted
C.invented
D.designed
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单项选择题
A.ByB.AtC.InD.On
A.By
B.At
C.In
D.On
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